finish RegionKind rename

- `ReFree` -> `ReLateParam`
- `ReEarlyBound` -> `ReEarlyParam`

compiler/rustc_hir_analysis/src/coherence/builtin.rs

@@ -550,7 +550,7 @@ fn infringing_fields_error(
                                 .entry((ty.clone(), predicate.clone()))
                                 .or_default()
                                 .push(origin.span());
-                            if let ty::RegionKind::ReEarlyBound(ebr) = *b
+                            if let ty::RegionKind::ReEarlyParam(ebr) = *b
                                 && ebr.has_name()
                             {
                                 bounds.push((b.to_string(), a.to_string(), None));